package Yukicoder

/**
 * Created by hichikawa on 2015/11/11.
 */
fun main(args: Array<String>) {
    fun readLineStringArray() : List<String> {
        val str = readLine() as String
        val arrStr = str.split(" ")
        return arrStr
    }
    fun readLineLong() : Long {
        val str = readLine() as String
        return str.toLong()
    }
//    fun calcCountDNA(num : Int, c1 : Char, c2 : Char, c3 : Char) : Int {
//        var count = 1
//        if (num == 0) {
//            return count
//        }
//        if (c1 != 'A' && c2 != 'A' && c3 != 'A') {
//            count += calcCountDNA(num - 1, 'A', c1, c2)
//        }
//        if (c1 != 'B' && c2 != 'B' && c3 != 'B') {
//            count += calcCountDNA(num - 1, 'B', c1, c2)
//        }
//        return count
//    }

    val len = readLineLong()
    val num = readLineLong()
    println(Math.pow(2.0,len-3.0).toInt()*num)

}